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<pre class="textdiagram" id="fig47">
            Cluster 1          :         Cluster 2
                               :
                               :
          |            |               |            |
          +------------+               +------------+
          |   ROUTER   |               |   ROUTER   |
          +-----+------+               +-----+------+
                |                            |
      +---------|-+--=--------+--------------+
      :         | :           :
    +-----------+-----------+ :
    | :         | :         | :
    | :         | :         | :
+---+-+--+  +---+-+--+  +---+-+--+
| ROUTER |  | ROUTER |  | ROUTER |
+--------+  +--------+  +--------+
| Worker |  | Worker |  | Worker |
+--------+  +--------+  +--------+
</pre>
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